1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * The On Chip Memory (OCMEM) allocator allows various clients to allocate
4  * memory from OCMEM based on performance, latency and power requirements.
5  * This is typically used by the GPU, camera/video, and audio components on
6  * some Snapdragon SoCs.
7  *
8  * Copyright (C) 2019 Brian Masney <masneyb@onstation.org>
9  * Copyright (C) 2015 Red Hat. Author: Rob Clark <robdclark@gmail.com>
10  */
11 
12 #include <linux/device.h>
13 #include <linux/err.h>
14 
15 #ifndef __OCMEM_H__
16 #define __OCMEM_H__
17 
18 enum ocmem_client {
19 	/* GMEM clients */
20 	OCMEM_GRAPHICS = 0x0,
21 	/*
22 	 * TODO add more once ocmem_allocate() is clever enough to
23 	 * deal with multiple clients.
24 	 */
25 	OCMEM_CLIENT_MAX,
26 };
27 
28 struct ocmem;
29 
30 struct ocmem_buf {
31 	unsigned long offset;
32 	unsigned long addr;
33 	unsigned long len;
34 };
35 
36 #if IS_ENABLED(CONFIG_QCOM_OCMEM)
37 
38 struct ocmem *of_get_ocmem(struct device *dev);
39 struct ocmem_buf *ocmem_allocate(struct ocmem *ocmem, enum ocmem_client client,
40 				 unsigned long size);
41 void ocmem_free(struct ocmem *ocmem, enum ocmem_client client,
42 		struct ocmem_buf *buf);
43 
44 #else /* IS_ENABLED(CONFIG_QCOM_OCMEM) */
45 
of_get_ocmem(struct device * dev)46 static inline struct ocmem *of_get_ocmem(struct device *dev)
47 {
48 	return ERR_PTR(-ENODEV);
49 }
50 
ocmem_allocate(struct ocmem * ocmem,enum ocmem_client client,unsigned long size)51 static inline struct ocmem_buf *ocmem_allocate(struct ocmem *ocmem,
52 					       enum ocmem_client client,
53 					       unsigned long size)
54 {
55 	return ERR_PTR(-ENODEV);
56 }
57 
ocmem_free(struct ocmem * ocmem,enum ocmem_client client,struct ocmem_buf * buf)58 static inline void ocmem_free(struct ocmem *ocmem, enum ocmem_client client,
59 			      struct ocmem_buf *buf)
60 {
61 }
62 
63 #endif /* IS_ENABLED(CONFIG_QCOM_OCMEM) */
64 
65 #endif /* __OCMEM_H__ */
66